Figure 8. Interaction between parameters in terms of (a) A×C (for diethyl ether cyclic recovery), (b) A×D (for diethyl ether cyclic recovery), (c) B×C (for diethyl ether cyclic recovery), (d) D×C (for ethanol cyclic recovery), (e) B×C (for ethanol cyclic recovery), (f) A×B (for total operating), (g) A×C (for total operating), (h) B×C (for total operating)
Table 4 shows the optimal results for only one response. For multi-objective optimization, simultaneously recovery of diethyl ether and ethanol are set to maximum while minimum operating cost is desired. Last row in Table 4 shows theoptimal conditions for all three objectives using the Design expert® software.